[ICR], a Todoist user, has created a KICK-ASS Firefox plugin that integrates Todoist even better into Gmail. Kudos to Andrew, he did this without any help from me and in only one day. Truly a Todoist :)

Features in pictures

Your emails are decorated with a Add To Todoist link:

When Add To Todoist is clicked a modal window pops up (GreyBox of course):

To install the plugin, follow Gmail integration guide on Info page or view it online.